The preparation of boron-containing aluminoxanes and their application as cocatalysts in the polymerization of olefins
The preparation of boron-containing aluminoxanes and their application as cocatalysts in the polymerization of olefins
复制标题
含硼铝氧烷的制备及其作为烯烃聚合助催化剂的应用
作者：
Tanaka;R.; Hirose;T.; Nakayama;Y.; Shiono;T.
用不同的芳基硼酸部分质子化Me 3Al制备了含硼铝氧烷（BMAO）。与Me 3 Al水解生成的甲基铝氧烷（MAO）相比，在相同Al/Ti比下，由C6 F5 B（OH）2和Me 3 Al制备的BMAO在钛基烯烃聚合催化剂（ansa-Me 2 Si（Flu）（NtBu）TiMe 2; 5）中具有更高的活性。当使用BMAO时，丙烯消耗的时间过程显示催化剂的失活，而5-dMAO体系促进活性聚合。在BMAO中，只有那些来自芳基硼酸与吸电子基团被观察到作为有效的助催化剂。
Boron-moiety-containing aluminoxanes (BMAOs) were prepared from the partial protonolysis of Me 3 Al using various arylboronic acids. Compared with methylaluminoxane (MAO) generated from the hydrolysis of Me 3 Al, BMAO prepared from C 6 F 5 B (OH) 2 and Me 3 Al induced a higher activity at the same Al/Ti ratio in the Ti-based olefin polymerization catalyst (ansa-Me 2 Si (Flu)(N t Bu) TiMe 2; 5). The time course of propylene consumption when using BMAO showed the deactivation of the catalyst, whereas the 5–dMAO system promoted a living polymerization. Among the BMAOs, only those derived from arylboronic acids with electron-withdrawing groups were observed to act as efficient cocatalysts.